Taxacom: summary of vicariance and dispersal

[John Grehan]

I see from reading the literature, and from comments some on Taxacom have
made, that many are still confused about dispersal and vicariance. I have
excerpted a summary (my color highlights) from Heads (2015) that puts it
all together with some great clarity I think. Going forward there is no
justified basis for further confusion about these concepts and
panbiogeography - in my opinion.

Cheers, John

*Summary on vicariance and dispersal*

Traditional (dispersal) theory and most current (program-based)
biogeography explain allopatry by chance dispersal, and overlap by normal
dispersal.  Instead, the vicariance approach followed here explains
allopatry by vicariance, overlap by normal dispersal.

   The centre of origin/dispersal model relies on idiosyncratic, chance
explanations for each individual clade. Long-distance dispersal involves
one-off events, that all occur at different times and are not related to
means of dispersal, or to any other biological or environmental factor. It
does not make any particular predictions. In contrast, vicariance predicts
that similar distributions will be shared by large numbers of taxa in a
community, and that the taxa will show a wide range in their ecology and
means of dispersal.

-- 
https://nam10.safelinks.protection.outlook.com/?url=https%3A%2F%2Fhepialidsoftheworld.com.au%2F&data=05%7C02%7Ctaxacom%40lists.ku.edu%7Cc2045aa363a74f7085e508ddd1ebe7f9%7C3c176536afe643f5b96636feabbe3c1a%7C0%7C0%7C638897533335071501%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=3vz8VBsV%2F2AqMAO91P5qKr16PEPAtF4Za5IVPD7p7OE%3D&reserved=0 (use the 'visit archived web site'
link, then the 'Ghost Moth Research page' link.